heckelphone
Concise Oxford English Dictionary © 2008 Oxford University Press:
heckelphone /ˈhɛk(ə)lfəʊn/
▶noun a woodwind instrument resembling a large oboe, with a range about an octave lower.
– origin early 20th cent.: named after the German instrument-maker Wilhelm Heckel, on the pattern of saxophone.
'heckelphone' also found in these Oxford entries:

